Step-by-step explanation: In this question you need to know that a sum is the answer when you add numbers. In this case x = any number. The expression is x + 3
The total number of cups for younger kids is 3.66 and for the older kids its 7.5 so if you add those together it is about 11.16 which is less than 12 cups, so your answer is yes she does have enough
